Late Friday security services acted on a warning from the country’s Coordinating Unit for Threat Analysis (OCAM), the RTBF public broadcaster said. There were no details on the nature of the threat.

According to RTBF, security was stepped up for those in top government jobs — the prime minister, the foreign policy chief, the minister of interior and the main justice official. No additional safety measures for police departments or trade centers were taken.

Belgium raised its terror alert to the highest fourth level following the March terrorist attacks in the Brussels Airport and in the subway that killed 35 people and injured over 300.